What is the battery life of the batteries on the EP/LP series controllers?

On the EP/LP1502 and EP/LP2500, the stored database will be saved for a minimum of three months after power is removed, assuming that the coin cell battery is fresh.

On the EP/LP1501, a fully charged battery will store the database for a minimum of three days.  It can take up to 48 hours to fully charge the re-chargeable battery.